Key Largo Sea Temperature in May

Can you swim or snorkel in Key Largo in May?

At 28.9°C our temperature-only guide describes the water as very warm water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.

Do you need a wetsuit?

Swimwear is usually enough; a rash guard adds sun protection.

Which beach should you choose?

Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.

Key Largo is the northern gateway to the Florida Keys reef tract, including John Pennekamp Coral Reef State Park. Use this page for water temperature, then check the live forecast for wind, waves and the day's snorkel score. Temperature alone is not a safety rating.

Check the current waves, wind and snorkeling forecast →

A live forecast does not predict a future May. Check again close to your trip.

Waves and wind: recorded-model conditions for May

These figures come from a separately modelled, date-specific wind/wave backfill, not the NOAA SST series. A single observed season is not a climatological likelihood or a guarantee of safe conditions.

Compare nearby coasts with their own evidence

A “calm hour” meets fixed modelled wave/wind thresholds; neither visibility nor local currents, entry conditions or actual beach safety is measured here. Periods may differ by coast.